# io.netty:netty-handler-ssl-ocsp (Maven) vulnerabilities

3 known vulnerabilities (3 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 4.2.20.Final (Nov 2, 2026): no advisory affects it
- Newest unaffected release: 4.2.20.Final (Nov 2, 2026), the latest release
- Dependents: 226
- Releases: 86 since 4.1.86.Final (Dec 12, 2022)
- Registry: https://central.sonatype.com/artifact/io.netty/netty-handler-ssl-ocsp
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-56822: 4.1.86.Final to 4.1.135.Final (4.1.136.Final is outside it); 4.2.0.Final to 4.2.15.Final (4.2.16.Final is outside it)
- CVE-2026-56821: 4.1.86.Final to 4.1.135.Final (4.1.136.Final is outside it); 4.2.0.Final to 4.2.15.Final (4.2.16.Final is outside it)
- CVE-2026-56820: 4.1.86.Final to 4.1.135.Final (4.1.136.Final is outside it); 4.2.0.Final to 4.2.15.Final (4.2.16.Final is outside it)

## Advisories (3)

### [CVE-2026-56822](https://cve.now/CVE-2026-56822): Netty: TOCTOU in OcspServerCertificateValidator

- Severity: High 7.4
- Published: Jul 28, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.16.Final; fixed in 4.1.136.Final.
- Fixed in 4.1.136.Final (released Jul 8, 2026, 20 days before disclosure) and 4.2.16.Final (released Jul 7, 2026, 21 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-56821](https://cve.now/CVE-2026-56821): Netty: Out-of-date OCSP Responses Accepted by OcspServerCertificateValidator

- Severity: High 7.4
- Published: Jul 28, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.16.Final; fixed in 4.1.136.Final.
- Fixed in 4.1.136.Final (released Jul 8, 2026, 20 days before disclosure) and 4.2.16.Final (released Jul 7, 2026, 21 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

### [CVE-2026-56820](https://cve.now/CVE-2026-56820): Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks

- Severity: High 7.4
- Published: Jul 21, 2026
- Affected: from 4.2.0.Final, fixed in 4.2.16.Final; fixed in 4.1.136.Final.
- Fixed in 4.1.136.Final (released Jul 8, 2026, 13 days before disclosure) and 4.2.16.Final (released Jul 7, 2026, 14 days before disclosure).
- The latest release, 4.2.20.Final, is not affected.

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